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Not sure this would be any better than the Porsche manual
[sarcastic-mode]Well, it’s roughly 1/18th the size of the WSM and since the 924 has SOOOO much in common with the 928 then it must be just as good.[/sarcastic-mode]
Seriously, this is not even a question: the Chilton is a (bad) coloring book next to the WSM.
Not sure this would be any better than the Porsche manual
... before the interweb, maybe even before FWSM were available to civilians. Best review I heard at the time was 'Maybe you could figure out how to change your oil from reading it...' :-/